TWI638202B - Optical image capturing system - Google Patents

Optical image capturing system

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Publication number
TWI638202B
TWI638202B TW106116010A TW106116010A TWI638202B TW I638202 B TWI638202 B TW I638202B TW 106116010 A TW106116010 A TW 106116010A TW 106116010 A TW106116010 A TW 106116010A TW I638202 B TWI638202 B TW I638202B
Authority
TW
Taiwan
Prior art keywords
lens
optical axis
imaging system
optical
refractive power
Prior art date
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TW106116010A
Other languages
Chinese (zh)
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TW201901226A (en
Inventor
張永明
賴建勳
唐廼元
Original Assignee
先進光電科技股份有限公司
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Priority to TW106116010A priority Critical patent/TWI638202B/en
Application granted granted Critical
Publication of TWI638202B publication Critical patent/TWI638202B/en
Publication of TW201901226A publication Critical patent/TW201901226A/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/14Optical objectives specially designed for the purposes specified below for use with infra-red or ultra-violet radiation
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B9/00Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/2251Constructional details
    • H04N5/2253Mounting of pick-up device, electronic image sensor, deviation or focusing coils

Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence from the object side to the image side. At least one of the first to seventh lenses has a positive refractive power. The eighth lens may have a negative refractive power, wherein at least one surface of the eighth lens has an inflection point. The refractive power lens in the optical imaging system is a first lens to an eighth lens. When certain conditions are met, greater light collection and better light path adjustment can be achieved to improve image quality.

Description

Optical imaging system

This invention relates to an optical imaging system set, and more particularly to a miniaturized optical imaging system set for use in electronic products.

In recent years, with the rise of portable electronic products with photographic functions, the demand for optical systems has increased. Generally, the photosensitive element of the optical system is nothing more than a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor), and with the advancement of semiconductor process technology, As the size of the pixel of the photosensitive element is reduced, the optical system is gradually developed in the field of high-pixels, and thus the requirements for image quality are increasing.

The optical system traditionally mounted on the portable device is mainly composed of a six-piece or seven-piece lens structure. However, since the portable device continues to enhance the pixels and the end consumer demand for a large aperture such as low light and night The shooting function, the conventional optical imaging system can not meet the higher order photography requirements.

Therefore, how to effectively increase the amount of light entering the optical imaging lens and further improve the quality of imaging has become a very important issue.

The embodiment of the present invention is directed to an optical imaging system and an optical image capturing lens, which can utilize the combination of refractive power, convex surface and concave surface of eight lenses (the convex or concave surface of the present invention refers in principle to the object side of each lens). Or a description of the geometry change at different heights from the side of the optical axis, thereby effectively increasing the amount of light entering the optical imaging system while improving imaging quality for use in small electronic products.

In addition, in certain optical imaging applications, there is a need to simultaneously image light sources of visible and infrared wavelengths, such as IP image surveillance cameras. IP image surveillance The "Day & Night" function of the camera is mainly due to the fact that human visible light is located at 400-700 nm in the spectrum, but the imaging of the sensor contains human invisible infrared light, so in order to ensure sensing In the end, only the visible light of the human eye is retained. In the case of the lens, an IR Cut filter Removable (ICR) can be added in front of the lens to increase the "reality" of the image, which can eliminate infrared light during the daytime. Avoid color cast; at night, let infrared light come in to increase brightness. However, the ICR components themselves are quite bulky and expensive, which is detrimental to the design and manufacture of miniature surveillance cameras in the future.

Aspects of the embodiments of the present invention are directed to an optical imaging system and an optical image capturing lens, which can utilize the refractive power of eight lenses, the combination of convex and concave surfaces, and the selection of materials to make the imaging focus and visible light of the optical imaging system for visible light. The difference in imaging focal length is reduced, that is, the effect of approaching "confocal" is achieved, so there is no need to use ICR components.

Lens parameters related to the magnification of the optical imaging system and the optical image capture lens

The optical imaging system and the optical image capturing lens of the present invention can be simultaneously designed for biometric identification, for example, for face recognition. In the embodiment of the present invention, if the image is captured as a face recognition, infrared light can be selected as the working wavelength, and at the same time, for a face with a distance of about 25 to 30 cm and a width of about 15 cm, the photosensitive element (pixel size) can be used. At least 30 horizontal pixels are imaged in the horizontal direction for 1.4 micrometers (μm). The line magnification of the infrared light imaging surface is LM, which satisfies the following conditions: LM = (30 horizontal pixels) multiplied by (pixel size 1.4 μm) divided by the object width 15 cm; LM ≧ 0.0003. At the same time, visible light is used as the working wavelength, and for a face with a distance of about 25 to 30 cm and a width of about 15 cm, at least 50 images can be imaged in the horizontal direction on the photosensitive element (pixel size is 1.4 micrometers (μm)). Horizontal pixels.

The terms of the lens parameters and their codes associated with the embodiments of the present invention are listed below as a reference for subsequent description: the present invention can select a wavelength of 555 nm as the main reference wavelength and a reference for measuring the focus shift in the visible light spectrum, in the infrared spectrum (700 nm to 1300 nm) The wavelength 850 nm can be selected as the primary reference wavelength and the reference for measuring the focus shift.

The optical imaging system has a first imaging surface and a second imaging surface, the first imaging surface being a visible light image plane perpendicular to the optical axis and having a central field of view in the first space The frequency defocus modulation conversion contrast transfer rate (MTF) has a maximum value; and the second imaging plane is a specific infrared light image plane perpendicular to the optical axis and the defocus modulation conversion contrast of the central field of view at the first spatial frequency The transfer rate (MTF) has a maximum value. The optical imaging system further has a first average imaging plane and a second average imaging plane, the first average imaging plane being a visible light image plane perpendicular to the optical axis and disposed at a central field of view of the optical imaging system, 0.3 The field and the 0.7 field of view are each an average position of the defocus position of each of the first MTF values of the field of view; and the second average imaging plane is a specific infrared image plane perpendicular to the optical axis and is disposed at The central field of view, the 0.3 field of view, and the 0.7 field of view of the optical imaging system each have an average position of the out-of-focus position of each of the maximum MTF values of the field of view.

The first spatial frequency is set to a half-space frequency (half-frequency) of the photosensitive element (sensor) used in the present invention, for example, a pixel size (Pixel Size) is a photosensitive element having a wavelength of 1.12 μm or less, and a modulation conversion function characteristic thereof. The quarter spatial frequency, half space frequency (half frequency) and full spatial frequency (full frequency) of the figure are at least 110 cycles/mm, 220 cycles/mm and 440 cycles/mm, respectively. The light of any field of view can be further divided into sagittal ray and tangential ray.

The focus shift of the visible focus center field of view, the 0.3 field of view, and the 0.7 field of view of the off-focus MTF maximum of the optical imaging system of the present invention is represented by VSFS0, VSFS3, VSFS7 (measured in mm); visible light center The maximum defocus MTF of the sagittal ray of the field of view, 0.3 field of view, and 0.7 field of view is represented by VSMTF0, VSMTF3, and VSMTF7, respectively; the visible focus center field, 0.3 field of view, and 0.7 field of view of the meridional plane are the largest off-focus MTF. The focus offset of the value is represented by VTFS0, VTFS3, VTFS7 (measurement unit: mm); the maximum defocus MTF of the visible light center field of view, 0.3 field of view, and 0.7 field of view of the meridional plane ray is VTMTF0, VTMTF3, VTMTF7, respectively. Said. The average focus offset (position) of the aforementioned visible light sagittal three-field and the focal displacement of the three-field of the visible light meridional plane is expressed in AVFS (unit of measure: mm), which satisfies the absolute value | (VSFS0+VSFS3+VSFS7+ VTFS0+VTFS3+VTFS7)/6|.

The focus shift of the infrared light center field of view, the 0.3 field of view, and the 0.7 field of view of the off-focus MTF maximum of the optical field of the present invention is represented by ISFS0, ISFS3, ISFS7, respectively, and the aforementioned sagittal plane three fields of view The average focus offset (position) of the focus offset is represented by AISFS (measurement unit: mm); the infrared focus center field, the 0.3 field of view, and the 0.7 field of view of the sagittal plane of the defocusing MTF maximum are respectively ISMTF0, ISMTF3, ISMTF7 said; infrared light center field of view, The focus shift of the defocusing MTF maximum of the meridional plane ray of 0.3 field of view and 0.7 field of view is represented by ITFS0, ITFS3, ITFS7 (measurement unit: mm), and the average of the focus shift of the three fields of view of the aforementioned meridional plane The focus offset (position) is represented by AITFS (unit of measure: mm); the defocusing MTF maximum values of the infrared light center field of view, the 0.3 field of view, and the 0.7 field of view of the meridional plane rays are represented by ITMTF0, ITMTF3, and ITMTF7, respectively. The average focus offset (position) of the three-field field of the infrared light sagittal plane and the three-field of the infrared photon meridional field is expressed by AIFS (measurement unit: mm), which satisfies the absolute value | (ISFS0+ISFS3+ ISFS7+ITFS0+ITFS3+ITFS7)/6|.

The focus offset between the visible center field of view and the infrared center of field of view (RGB/IR) of the entire optical imaging system is expressed as FS (ie, wavelength 850 nm versus wavelength 555 nm, unit of measure: mm), which satisfies Absolute value|(VSFS0+VTFS0)/2-(ISFS0+ITFS0)/2|; visible light three-field average focus offset and infrared light three-field average focus offset (RGB/IR) for the entire optical imaging system The difference (focus offset) is expressed in AFS (ie, wavelength 850 nm versus wavelength 555 nm, unit of measure: mm), which satisfies the absolute value |AIFS-AVFS|.

Lens parameters related to length or height

The maximum imaging height of the optical imaging system is represented by HOI; the height of the optical imaging system is represented by HOS; the distance between the first lens side of the optical imaging system and the side of the eighth lens image is represented by InTL; the fixed optical column of the optical imaging system ( The distance from the aperture to the imaging plane is denoted by InS; the distance between the first lens and the second lens of the optical imaging system is denoted by IN12 (exemplary); the thickness of the first lens of the optical imaging system on the optical axis is denoted by TP1 ( Illustrative).

Material-related lens parameters

The dispersion coefficient of the first lens of the optical imaging system is represented by NA1 (exemplary); the law of refraction of the first lens is represented by Nd1 (exemplary).

Lens parameters related to viewing angle

The angle of view is represented by AF; half of the angle of view is represented by HAF; the angle of the chief ray is expressed by MRA.

Lens parameters related to access

The entrance pupil diameter of the optical imaging lens system is expressed in HEP; the maximum effective radius of any surface of the single lens refers to the maximum viewing angle of the system through which the incident light passes through the edge of the entrance pupil at the intersection of the lens (Effective Half Diameter (EHD)). The vertical height between the intersection and the optical axis. For example, the maximum effective radius of the side of the first lens is represented by EHD11, and the maximum effective radius of the side of the first lens image is represented by EHD12. The maximum effective radius of the side of the second lens is indicated by EHD21. The maximum effective radius of the side of the second lens image is represented by EHD22. The maximum effective radius representation of any of the remaining lenses in the optical imaging system is analogous.

Parameters related to the depth of the lens profile

The intersection of the side of the eighth lens on the optical axis to the end of the maximum effective radius of the side of the eighth lens, the distance between the two points parallel to the optical axis is represented by InRS81 (maximum effective radius depth); the eighth lens image side The distance between the intersection of the two points on the optical axis and the maximum effective radius of the side of the eighth lens image is expressed by InRS 82 (maximum effective radius depth) between the two points. The depth (sinking amount) of the maximum effective radius of the side or image side of the other lens is expressed in the same manner as described above.

Parameters related to the lens surface

The critical point C refers to a point on the surface of a specific lens that is tangent to a plane perpendicular to the optical axis except for the intersection with the optical axis. For example, the vertical distance C51 of the side surface of the fifth lens object is perpendicular to the optical axis of HVT 51 (exemplary), and the vertical distance C52 of the side surface of the fifth lens image is perpendicular to the optical axis of HVT 52 (exemplary), the sixth lens The vertical distance of the side critical point C61 from the optical axis is HVT61 (exemplary), and the vertical distance C62 of the side of the sixth lens image from the optical axis is HVT62 (exemplary). Other lenses, such as the critical point on the object side or image side of the eighth lens and its vertical distance from the optical axis, are expressed in the same manner as described above.

The inflection point closest to the optical axis on the side of the eighth lens is IF811, the sinking amount SGI811 (exemplary), that is, the intersection of the side of the eighth lens object on the optical axis to the optical axis of the eighth lens object The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between the point and the optical axis of the IF811 is HIF811 (exemplary). The inflection point closest to the optical axis on the side of the eighth lens image is IF821, the sinking amount SGI821 (exemplary), that is, the intersection of the eighth lens image side on the optical axis and the optical axis of the eighth lens image side. The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between the point and the optical axis of the IF821 is HIF821 (exemplary).

The inflection point of the second near-optical axis on the side of the eighth lens object is IF812, the point sinking amount SGI812 (exemplary), that is, the SGI812 is the second lens object side intersection on the optical axis to the eighth lens object side second close The horizontal displacement distance between the inflection point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF812 is HIF812 (exemplary). The inflection point of the second near-optical axis on the side of the eighth lens image is IF822, and the point sinking amount SGI822 (exemplary), that is, the SGI822, that is, the intersection of the side of the eighth lens image on the optical axis and the side of the eighth lens image is second. The inflection point of the optical axis is flat with the optical axis The horizontal displacement distance of the line, the vertical distance between the point and the optical axis of IF822 is HIF822 (exemplary).

The inflection point of the third near-optical axis on the side of the eighth lens object is IF813, and the point sinking amount SGI813 (exemplary), that is, the SGI 813, that is, the intersection of the side surface of the eighth lens object on the optical axis and the side of the eighth lens object is the third closest. The horizontal displacement distance between the inflection point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of IF813 is HIF813 (exemplary). The inflection point of the third near-optical axis on the side of the eighth lens image is IF823, the point sinking amount SGI823 (exemplary), that is, the SGI823, that is, the intersection of the side of the eighth lens image on the optical axis and the side of the eighth lens image is the third closest. The horizontal displacement distance between the inflection points of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF823 is HIF823 (exemplary).

The inflection point of the fourth near optical axis on the side of the eighth lens object is IF814, the point sinking amount SGI814 (exemplary), that is, the SGI814 is the fourth lens object side intersection on the optical axis to the eighth lens object side fourth approaching The horizontal displacement distance between the inflection point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of IF814 is HIF814 (exemplary). The inflection point of the fourth near-optical axis on the side of the eighth lens image is IF824, the point sinking amount SGI824 (exemplary), that is, the SGI 824, that is, the intersection of the side of the eighth lens image on the optical axis and the side of the eighth lens image is fourth. The horizontal displacement distance between the inflection points of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF824 is HIF824 (exemplary).

The inflection point on the side or image side of the other lens and its vertical distance from the optical axis or the amount of its sinking are expressed in the same manner as described above.

Variant related to aberration

Optical Distortion of an optical imaging system is represented by ODT; its TV Distortion is represented by TDT, and can further define the degree of aberration shift described between imaging 50% to 100% of field of view; spherical aberration bias The shift is represented by DFS; the comet aberration offset is represented by DFC.

The modulation transfer function (MTF) of the optical imaging system is used to test and evaluate the contrast contrast and sharpness of the system imaging. The vertical coordinate axis of the modulation transfer function characteristic diagram represents the contrast transfer rate (values from 0 to 1), and the horizontal coordinate axis represents the spatial frequency (cycles/mm; lp/mm; line pairs per mm). A perfect imaging system can theoretically present a line contrast of the object 100%, whereas in an actual imaging system, the vertical transfer rate of the vertical axis is less than one. In addition, in general, the edge region of the image is harder to obtain a finer degree of reduction than the center region. The visible light spectrum on the imaging plane, the optical axis, the 0.3 field of view, and the 0.7 field of view three are at a spatial frequency of 55 cycles/mm. The contrast transfer rate (MTF value) is respectively MTFE0, MTFE3 and MTFE7 indicate that the optical axis, 0.3 field of view and 0.7 field of view three are at a spatial frequency of 110 cycles/mm. The contrast transfer rate (MTF value) is represented by MTFQ0, MTFQ3 and MTFQ7, respectively, optical axis, 0.3 field of view and 0.7 field of view. The contrast transfer rate (MTF value) at a spatial frequency of 220 cycles/mm is represented by MTFH0, MTFH3, and MTFH7, respectively, and the optical axis, 0.3 field of view, and 0.7 field of view three are at a spatial frequency of 440 cycles/mm, and the contrast transfer rate (MTF value) is respectively MTF0, MTF3, and MTF7 indicate that the aforementioned three fields of view are representative of the center, interior, and exterior fields of the lens, and thus can be used to evaluate whether the performance of a particular optical imaging system is excellent. If the design of the optical imaging system corresponds to a pixel size of 1.12 micrometers or less, the modulation of the transfer function characteristic map is one quarter of the spatial frequency, half of the spatial frequency (half frequency), and the full spatial frequency ( Full frequency) at least 110 cycles/mm, 220 cycles/mm and 440 cycles/mm, respectively.

If the optical imaging system must simultaneously satisfy the imaging of the infrared spectrum, such as the night vision requirement for low light sources, the operating wavelength can be 850 nm or 800 nm. Since the main function is to identify the contour of the object formed by black and white, no high resolution is required. Therefore, it is only necessary to select a spatial frequency of less than 110 cycles/mm to evaluate whether the performance of the specific optical imaging system in the infrared spectrum spectrum is excellent. The aforementioned working wavelength of 850 nm is focused on the imaging surface, and the contrast ratio (MTF value) of the image on the optical axis, the 0.3 field of view, and the 0.7 field of view at the spatial frequency of 55 cycles/mm is represented by MTFI0, MTFI3, and MTFI7, respectively. However, because the infrared working wavelength of 850 nm or 800 nm is far from the general visible wavelength, if the optical imaging system needs to focus on visible light and infrared (dual mode) at the same time and achieve certain performance, it is quite difficult to design.

The invention provides an optical imaging system, which can simultaneously focus on visible light and infrared light (dual mode) and achieve certain performance respectively, and the object side or image side of the eighth lens is provided with an inflection point, which can effectively adjust the incident fields of each field of view. The angle of the eighth lens is corrected for optical distortion and TV distortion. In addition, the surface of the eighth lens can have better optical path adjustment capability to improve image quality.

According to the present invention, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and the like from the object side to the image side. a first imaging surface and a second imaging surface. The first imaging plane is a visible light image plane that is perpendicular to the optical axis and has a central field of view of the defocusing modulation at the first spatial frequency. The contrast transfer rate (MTF) has a maximum value; the second imaging plane is a specific infrared light image plane perpendicular to the optical axis and the defocus modulation conversion contrast transfer rate (MTF) of the central field of view at the first spatial frequency is Maximum value. Each of the first lens to the eighth lens has a refractive power. The focal lengths of the first lens to the eighth lens are f1, f2, f3, f4, f5, f6, f7, and f8, respectively, the focal length of the optical imaging system is f, and the incident pupil diameter of the optical imaging system is HEP. The first lens side to the first imaging surface has a distance HOS on the optical axis, and the half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system has a vertical plane perpendicular to the optical axis. The maximum imaging height HOI, the distance between the first imaging surface and the second imaging surface on the optical axis is FS, and the thickness of the first lens to the eighth lens at 1/2 HEP height and parallel to the optical axis are respectively ETP1, ETP2, ETP3, ETP4, ETP5, ETP6, ETP7, and ETP8, the sum of the foregoing ETP1 to ETP8 is SETP, and the thickness of the first lens to the eighth lens on the optical axis are TP1, TP2, TP3, TP4, and TP5, respectively. TP6, TP7, and TP8, the sum of the foregoing TP1 to TP8 is STP, which satisfies the following conditions: 1.0 ≦ f / HEP ≦ 10.0; 0 deg < HAF ≦ 150 deg; 0.5 ≦ SETP / STP < 1 and | FS | ≦ 100 μm.

According to the present invention, an optical imaging system further includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side. a first imaging surface and a second imaging surface. The first imaging plane is a visible light image plane that is perpendicular to the optical axis and has a maximum value of the defocus modulation conversion contrast transfer ratio (MTF) of the central field of view at the first spatial frequency; the second imaging plane is a specific vertical The defocus modulation conversion contrast transfer rate (MTF) of the infrared optical image plane of the optical axis and its central field of view at the first spatial frequency has a maximum value. The first lens has a refractive power. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a refractive power. The fifth lens has a refractive power. The sixth lens has a refractive power. The seventh lens has a refractive power. The eighth lens has a refractive power. At least one of the first lens to the eighth lens is made of plastic. The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and at least one of the first lens to the eighth lens has a positive refractive power, and a focal length of the first lens to the eighth lens F1, f2, f3, f4, f5, f6, f7, f8, respectively, the focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the first lens side to the first imaging surface On the optical axis Having a distance HOS, half of the maximum viewing angle of the optical imaging system is HAF, the optical imaging system having a maximum imaging height HOI perpendicular to the optical axis on the first imaging surface, the first imaging surface and the second The distance between the imaging planes on the optical axis is FS, and the horizontal distance from the coordinate point of the 1/2 HEP height on the side of the first lens to the optical axis is ETL on the side of the first lens The horizontal distance from the coordinate point of the height of 1/2 HEP to the coordinate point of the height of 1/2 HEP on the side of the eighth lens image parallel to the optical axis is EIN, which satisfies the following condition: 1.0≦f/HEP≦10.0; 0 deg < HAF ≦ 150 deg; 0.2 ≦ EIN / ETL < 1 and | FS | ≦ 100 μm. According to the present invention, an optical imaging system further includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side. a first average imaging surface and a second average imaging surface. The first average imaging plane is a visible light image plane that is perpendicular to the optical axis and is disposed at a central field of view of the optical imaging system, a 0.3 field of view, and a 0.7 field of view, each having a maximum MTF of the field of view. The average position of the defocus position of the value; the second average imaging plane is a specific infrared image plane perpendicular to the optical axis and is disposed in the central field of view of the optical imaging system, 0.3 field of view and 0.7 field of view are individually The spatial frequencies each have an average position of the out-of-focus position of each of the maximum MTF values of the field of view. The optical imaging system has eight lenses having a refractive power, and the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the first imaging surface. The first lens has a refractive power. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a refractive power. The fifth lens has a refractive power. The sixth lens has a refractive power. The seventh lens has a refractive power. The eighth lens has a refractive power. And at least one of the first lens to the eighth lens has a positive refractive power, and the focal lengths of the first lens to the eighth lens are f1, f2, f3, f4, f5, f6, f7, and f8, respectively. The entrance pupil diameter of the imaging lens system is HEP, the first lens side to the first average imaging plane has a distance HOS on the optical axis, and the half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system is The first average imaging plane has a maximum imaging height HOI perpendicular to the optical axis, the distance between the first average imaging surface and the second average imaging surface is AFS, and the side of the first lens is at a height of 1/2 HEP. The horizontal distance between the coordinate point and the imaging plane parallel to the optical axis is ETL, and the coordinate point of the 1/2 HEP height on the side of the first lens object to the eighth lens image The horizontal distance between the coordinate points on the side of the height of 1/2 HEP parallel to the optical axis is EIN, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg; 0.2≦EIN/ETL<1 and | AFS|≦100μm.

The thickness of a single lens at a height of 1/2 incident pupil diameter (HEP), particularly affecting the corrected aberration of the common field of view of each ray in the range of 1/2 incident pupil diameter (HEP) and the optical path difference between the fields of view Capability, the greater the thickness, the improved ability to correct aberrations, but at the same time it increases the difficulty of manufacturing. Therefore, it is necessary to control the thickness of a single lens at a height of 1/2 incident helium diameter (HEP), especially to control the lens. The proportional relationship (ETP/TP) between the thickness of the 1/2 incident pupil diameter (HEP) height (ETP) and the thickness (TP) of the lens on the optical axis to which the surface belongs. For example, the thickness of the first lens at a height of 1/2 incident pupil diameter (HEP) is represented by ETP1. The thickness of the second lens at a height of 1/2 incident pupil diameter (HEP) is represented by ETP2. The thickness of the remaining lenses in the optical imaging system at the height of the 1/2 incident pupil diameter (HEP) is expressed by analogy. The sum of the aforementioned ETP1 to ETP8 is SETP, and an embodiment of the present invention can satisfy the following formula: 0.3≦SETP/EIN<1.

In order to simultaneously weigh the ability to improve the aberration correction and reduce the difficulty in manufacturing, it is particularly necessary to control the thickness (ETP) of the lens at a height of 1/2 incident pupil diameter (HEP) and the thickness of the lens on the optical axis (TP). The proportional relationship between (ETP/TP). For example, the thickness of the first lens at a height of 1/2 incident pupil diameter (HEP) is represented by ETP1, and the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ETP1/TP1. The thickness of the second lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP2, and the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ETP2/TP2. The proportional relationship between the thickness of the remaining lenses in the optical imaging system at the height of the 1/2 incident pupil diameter (HEP) and the thickness (TP) of the lens on the optical axis, and so on. Embodiments of the present invention can satisfy the following formula: 0.2 ≦ ETP / TP ≦ 5.

The horizontal distance between two adjacent lenses at a height of 1/2 incident pupil diameter (HEP) is represented by ED, which is parallel to the optical axis of the optical imaging system and particularly affects the diameter of the 1/2 incident pupil (HEP) The ability to correct the aberrations of the common field of view and the optical path difference between the fields of view, the greater the horizontal distance, the greater the possibility of correcting the aberrations, but at the same time increase the manufacturing difficulties. And the extent to which the length of the optical imaging system is "reduced", so the horizontal distance (ED) of a particular adjacent two lens at a height of 1/2 incident pupil diameter (HEP) must be controlled.

To simultaneously weigh the ability to improve aberrations and reduce the optical imaging system. The difficulty of length "shrinking", in particular, the horizontal distance (ED) of the adjacent two lenses at a height of 1/2 incident pupil diameter (HEP) and the horizontal distance (IN) of the adjacent two lenses on the optical axis The proportional relationship (ED/IN). For example, the horizontal distance between the first lens and the second lens at a height of 1/2 incident pupil diameter (HEP) is represented by ED12, and the horizontal distance between the first lens and the second lens on the optical axis is IN12, and the ratio between the two is ED12. /IN12. The horizontal distance between the second lens and the third lens at a height of 1/2 incident pupil diameter (HEP) is represented by ED23, and the horizontal distance between the second lens and the third lens on the optical axis is IN23, and the ratio between the two is ED23/ IN23. The proportional relationship between the horizontal distance of the remaining two lenses in the optical imaging system at the height of the 1/2 incident pupil diameter (HEP) and the horizontal distance of the adjacent two lenses on the optical axis, and so on.

The horizontal distance from the coordinate point of the 1/2 HEP height on the side of the eighth lens image to the optical axis is EBL, and the intersection of the eighth lens image side and the optical axis to the imaging surface is parallel to the light. The horizontal distance of the axis is BL. The embodiment of the present invention balances the ability to improve the corrected aberration and the accommodation space for other optical components, and can satisfy the following formula: 0.2 ≦ EBL / BL < 1.5. The optical imaging system may further include a filter element located between the seventh lens and the imaging surface, the eighth lens image side being parallel to the filter element at a coordinate point of 1/2 HEP height The distance from the optical axis is EIR, and the distance from the intersection of the eighth lens image side to the optical axis to the optical axis parallel to the optical axis is PIR. The embodiment of the present invention can satisfy the following formula: 0.1≦EIR/PIR ≦1.1.

Further, the eighth lens may have a negative refractive power, and the image side may be a concave surface. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the eighth lens may have at least one inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

10, 20, 30, 40, 50, 60‧‧‧ optical imaging systems

100, 200, 300, 400, 500, 600‧‧ ‧ aperture

110, 210, 310, 410, 510, 610‧‧‧ first lens

Sides of 112, 212, 312, 412, 512, 612‧‧

114, 214, 314, 414, 514, 614‧‧‧ side

120, 220, 320, 420, 520, 620‧‧‧ second lens

Sides of 122, 222, 322, 422, 522, 622‧‧

124, 224, 324, 424, 524, 624‧‧‧ side

130, 230, 330, 430, 530, 630‧ ‧ third lens

132, 232, 332, 432, 532, 632‧‧‧ ‧ side

134, 234, 334, 434, 534, 634 ‧ ‧ side

140, 240, 340, 440, 540, 640‧ ‧ fourth lens

Sides of 142, 242, 342, 442, 542, 642‧‧

144, 244, 344, 444, 544, 644‧‧‧

150, 250, 350, 450, 550, 650 ‧ ‧ fifth lens

152, 252, 352, 452, 552, 652‧‧ ‧ side

154, 254, 354, 454, 554, 654‧‧‧ side

160, 260, 360, 460, 560, 660 ‧ ‧ sixth lens

162, 262, 362, 462, 562, 662‧‧ ‧ side

164, 264, 364, 464, 564, 664 ‧ ‧ side

170, 270, 370, 470, 570, 670‧ ‧ eighth lens

Sides of 172, 272, 372, 472, 572, 672‧‧

174, 274, 374, 474, 574, 674 ‧ ‧ side

180, 280, 380, 480, 580, 680‧‧‧ Infrared filters

190, 290, 390, 490, 590, 690‧‧ ‧ imaging surface

192, 292, 392, 492, 592, 692‧‧‧ image sensing components

F‧‧‧focal length of optical imaging system

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

f3‧‧‧The focal length of the third lens

F4‧‧‧The focal length of the fourth lens

f5‧‧‧Focus of the fifth lens

F6‧‧‧The focal length of the sixth lens

F7‧‧‧The focal length of the eighth lens

f/HEP; Fno; F#‧‧‧ aperture value of optical imaging system

Half of the largest perspective of the HAF‧‧ optical imaging system

NA1‧‧‧Dispersion coefficient of the first lens

The dispersion coefficient of NA2, NA3, NA4, NA5, NA6, NA7‧‧‧ second lens to eighth lens

R1, R2‧‧‧ radius of curvature of the side of the first lens and the side of the image

R3, R4‧‧‧ radius of curvature of the side and image side of the second lens

R5, R6‧‧‧ radius of curvature of the side and image side of the third lens

R7, R8‧‧‧ fourth lens object side and image side radius of curvature

R9, R10‧‧‧ radius of curvature of the side of the fifth lens and the side of the image

R11, R12‧‧‧ the radius of curvature of the side of the sixth lens and the side of the image

R13, R14‧‧‧ radius of curvature of the side of the eighth lens and the side of the image

TP1‧‧‧ thickness of the first lens on the optical axis

TP2, TP3, TP4, TP5, TP6, TP7‧‧‧ thickness of the second to eighth lenses on the optical axis

TP TP‧‧‧sum of the thickness of all refractive lenses

IN12‧‧‧The distance between the first lens and the second lens on the optical axis

IN23‧‧‧Separation distance between the second lens and the third lens on the optical axis

The distance between the third lens and the fourth lens on the optical axis of IN34‧‧‧

IN45‧‧‧The distance between the fourth lens and the fifth lens on the optical axis

The distance between the fifth lens and the sixth lens on the optical axis of IN56‧‧‧

The distance between the IN67‧‧‧ sixth lens and the eighth lens on the optical axis

InRS71‧‧‧ Horizontal displacement distance of the eighth lens from the intersection of the side on the optical axis to the maximum effective radius of the side of the eighth lens on the optical axis

IF811‧‧‧ the elbow point on the side of the eighth lens closest to the optical axis

SGI811‧‧‧The amount of subsidence at this point

HIF811‧‧‧ Vertical distance between the inflection point closest to the optical axis on the side of the eighth lens and the optical axis

The inflection point of the IF821‧‧‧ eighth lens image on the side closest to the optical axis

SGI821‧‧‧The amount of subsidence

HIF821‧‧‧The vertical distance between the inflection point closest to the optical axis on the side of the eighth lens image and the optical axis

IF812‧‧‧ The second invisible point on the side of the eighth lens

SGI812‧‧‧The amount of subsidence at this point

HIF812‧‧‧The vertical distance between the inflection point of the second lens object and the optical axis

IF822‧‧‧ Eighth lens image on the side of the second near the optical axis of the inflection point

SGI822‧‧‧The amount of subsidence

HIF822‧‧‧The distance between the inflection point of the eighth lens near the optical axis and the vertical distance between the optical axes

C81‧‧‧The critical point on the side of the eighth lens

C82‧‧‧The critical point of the eighth lens side

SGC81‧‧‧ Horizontal displacement distance from the critical point of the eighth lens to the optical axis

SGC82‧‧‧ Horizontal displacement distance between the critical point of the eighth lens image side and the optical axis

HVT81‧‧‧The vertical distance between the critical point of the eighth lens and the optical axis

HVT82‧‧‧The distance between the critical point of the eighth lens image side and the optical axis

Total height of the HOS‧‧‧ system (distance from the side of the first lens to the optical axis of the imaging surface)

Diagonal length of Dg‧‧ image sensing components

InS‧‧‧ aperture to imaging surface distance

InTL‧‧‧Distance of the side of the first lens to the side of the eighth lens

InB‧‧‧ distance from the side of the eighth lens image to the image plane

HOI‧‧‧ image sensing element effectively detects half of the diagonal length of the area (maximum image height)

TV Distortion of TDT‧‧‧ optical imaging system during image formation

Optical Distortion of ODT‧‧‧Optical Imaging System in Image Formation

The above and other features of the present invention will be described in detail with reference to the drawings.

1A is a schematic view showing an optical imaging system according to a first embodiment of the present invention; FIG. 1B is a left-to-right sequence showing spherical aberration, astigmatism, and optical distortion of the optical imaging system according to the first embodiment of the present invention. Graph; 1C is a visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the embodiment; FIG. 1D is a center field of the visible light spectrum, 0.3 field of view, and 0.7 field of view defocus of the first embodiment of the present invention. The modulation conversion contrast transfer rate map (Through Focus MTF); FIG. 1E is a diagram showing the center field of the infrared light spectrum of the first embodiment of the present invention, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate map; 2A is a schematic view showing an optical imaging system according to a second embodiment of the present invention; and FIG. 2B is a left-to-right sequence showing spherical aberration, astigmatism, and optical distortion of the optical imaging system according to the second embodiment of the present invention. 2C is a visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the present embodiment; 2D is a central field of view, 0.3 field of view, and 0.7 field of view of the visible light spectrum of the second embodiment of the present invention; The defocus modulation conversion contrast transfer rate map; the second E diagram shows the central field of view of the infrared light spectrum of the second embodiment of the present invention, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate diagram; The figure shows the third embodiment of the present invention FIG. 3B is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system of the third embodiment of the present invention from left to right; FIG. 3C is a diagram showing the implementation Example of visible light spectrum modulation conversion characteristic map of an optical imaging system; FIG. 3D is a diagram showing a central field of view of a visible light spectrum, a 0.3 field of view, and a 0.7 field of view defocus modulation conversion contrast transfer rate diagram according to a third embodiment of the present invention; 3E is a diagram showing a central field of view of the infrared spectrum of the third embodiment of the present invention, a defocus modulation conversion contrast transfer rate map of 0.3 field of view, and a 0.7 field of view; FIG. 4A is a diagram showing a fourth embodiment of the present invention. Schematic diagram of the optical imaging system; FIG. 4B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system of the fourth embodiment of the present invention from left to right; 4C is a visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the embodiment; FIG. 4D is a center field of the visible light spectrum, 0.3 field of view, and 0.7 field of view defocus of the fourth embodiment of the present invention. Modulation conversion contrast transfer rate map; FIG. 4E is a diagram showing the center field of the infrared light spectrum, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate diagram of the fourth embodiment of the present invention; A schematic diagram showing an optical imaging system according to a fifth embodiment of the present invention; FIG. 5B is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fifth embodiment of the present invention from left to right; The figure shows the visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the embodiment; the 5D figure shows the central field of view of the visible light spectrum, the 0.3 field of view, and the defocusing modulation conversion of the 0.7 field of view of the fifth embodiment of the present invention. Comparing the transfer rate map; FIG. 5E is a diagram showing the center field of the infrared light spectrum of the fifth embodiment of the present invention, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate diagram; FIG. 6A is a diagram showing Optical imaging of a sixth embodiment of the invention FIG. 6B is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system of the sixth embodiment of the present invention from left to right; FIG. 6C is a diagram showing the optical imaging system of the present embodiment. The visible light spectrum modulation conversion characteristic map; the 6D figure shows the central field of view of the visible light spectrum, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate diagram of the sixth embodiment of the present invention; A defocus modulation conversion contrast transfer rate map of a central field of view, a 0.3 field of view, and a 0.7 field of view of the infrared light spectrum of the sixth embodiment of the present invention.

A group of optical imaging systems, comprising a first lens having a refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh from the object side to the image side a lens, an eighth lens, and an imaging surface. The optical imaging system can further include an image sensing component disposed on the imaging surface.

The optical imaging system can be designed using three operating wavelengths, 486.1 nm, 587.5 nm, and 656.2 nm, respectively, with 587.5 nm being the reference wavelength at which the primary reference wavelength is the dominant extraction technique. The optical imaging system can also be designed using five operating wavelengths, namely 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm, with 555 nm being the reference wavelength at which the primary reference wavelength is the dominant extraction technique.

The optical imaging system can further include an image sensing component disposed on the imaging surface. The half of the diagonal length of the effective sensing area of the image sensing element (ie, the imaging height or the maximum image height of the optical imaging system) is HOI, and the distance from the side of the first lens to the optical axis of the imaging surface is HOS, The following conditions are met: HOS/HOI ≦ 30; and 0.5 ≦ HOS/f ≦ 30. Preferably, the following conditions are satisfied: 1 ≦ HOS / HOI ≦ 10; and 1 ≦ HOS / f ≦ 10. Thereby, the miniaturization of the optical imaging system can be maintained to be mounted on a thin and portable electronic product.

In addition, in the optical imaging system of the present invention, at least one aperture can be disposed as needed to reduce stray light, which helps to improve image quality.

In the optical imaging system of the present invention, the aperture configuration may be a front aperture or a center aperture, wherein the front aperture means that the aperture is disposed between the object and the first lens, and the center aperture means that the aperture is disposed on the first lens and Between the imaging surfaces. If the aperture is a front aperture, the optical imaging system can make a long distance between the exit pupil and the imaging surface to accommodate more optical components, and increase the efficiency of the image sensing component to receive images; if it is a center aperture, Helps to expand the system's field of view, giving optical imaging systems the advantage of a wide-angle lens. The distance from the aforementioned aperture to the imaging surface is InS, which satisfies the following condition: 0.2 ≦ InS/HOS ≦ 1.5. Thereby, it is possible to maintain both the miniaturization of the optical imaging system and the wide-angle characteristics.

In the optical imaging system of the present invention, the distance between the side surface of the first lens object and the side surface of the eighth lens image is InTL, and the total thickness of all the lenses having refractive power on the optical axis is Σ TP, which satisfies the following condition: 0.1≦Σ TP/InTL≦0.9. Thereby, the contrast of the system imaging and the yield of the lens manufacturing can be simultaneously taken into consideration and an appropriate back focus can be provided to accommodate other components.

The distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: IN12/f≦5.0. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

The distance between the seventh lens and the eighth lens on the optical axis is IN78, which satisfies The following conditions are: IN78/f≦0.8. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

The thicknesses of the first lens and the second lens on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: 0.1 ≦ (TP1 + IN12) / TP2 ≦ 10. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

The thicknesses of the seventh lens and the eighth lens on the optical axis are TP7 and TP8, respectively, and the distance between the two lenses on the optical axis is IN78, which satisfies the following condition: 0.1 ≦ (TP8 + IN78) / TP7 ≦ 10. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and reduce the overall height of the system.

The thicknesses of the third lens, the fourth lens and the fifth lens on the optical axis are TP3, TP4 and TP5, respectively, and the distance between the third lens and the fourth lens on the optical axis is IN34, and the fourth lens and the fifth lens are The separation distance on the optical axis is IN45, and the distance between the side of the first lens object and the side of the eighth lens image is InTL, which satisfies the following condition: 0.1 ≦ TP4 / (IN34 + TP4 + IN45) < 1. Thereby, the layer is slightly modified to correct the aberration generated by the incident light and reduce the total height of the system.

In the optical imaging system of the present invention, the vertical distance between the critical point C81 of the eighth lens object and the optical axis is HVT81, the vertical distance of the critical point C82 of the eighth lens image side from the optical axis is HVT82, and the eighth lens object side is The horizontal displacement distance from the intersection of the optical axis to the critical point C81 at the optical axis is SGC81, and the horizontal displacement distance of the eighth lens image side from the intersection on the optical axis to the critical point C82 at the optical axis is SGC82, which satisfies the following conditions. :0mm≦HVT81≦3mm;0mm<HVT82≦6mm;0≦HVT81/HVT82;0mm≦|SGC81|≦0.5mm;0mm<|SGC82|≦2mm; and 0<|SGC82|/(|SGC82|+TP8) ≦0.9. Thereby, the aberration of the off-axis field of view can be effectively corrected.

The optical imaging system of the present invention satisfies the following conditions: 0.2 ≦ HVT82/HOI ≦ 0.9. Preferably, the following conditions are satisfied: 0.3 ≦ HVT82 / HOI ≦ 0.8. Thereby, it contributes to the aberration correction of the peripheral field of view of the optical imaging system.

The optical imaging system of the present invention satisfies the following conditions: 0 ≦ HVT 82 / HOS ≦ 0.5. Preferably, the following conditions are satisfied: 0.2 ≦ HVT82/HOS ≦ 0.45. Thereby, it contributes to the aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of the present invention, the horizontal displacement distance parallel to the optical axis between the intersection of the side surface of the eighth lens object on the optical axis and the inversion point of the optical axis of the eighth lens object side is SGI811 indicates that the horizontal displacement distance parallel to the optical axis between the intersection of the side of the eighth lens image on the optical axis and the inversion point of the optical axis of the eighth lens image side is represented by SGI821, which satisfies the following condition: 0<SGI811/ (SGI811+TP8) ≦ 0.9; 0 < SGI821 / (SGI821 + TP8) ≦ 0.9. Preferably, the following conditions are satisfied: 0.1 ≦ SGI811 / (SGI811 + TP8) ≦ 0.6; 0.1 ≦ SGI821 / (SGI821 + TP8) ≦ 0.6.

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the eighth lens object on the optical axis to the inversion point of the second lens object and the second optical axis is represented by SGI812, and the image of the eighth lens is on the optical axis. The horizontal displacement distance parallel to the optical axis between the intersection point and the inflection point of the second near-optical axis of the eighth lens image side is represented by SGI822, which satisfies the following condition: 0<SGI812/(SGI812+TP8)≦0.9; 0<SGI822 /(SGI822+TP8)≦0.9. Preferably, the following conditions are satisfied: 0.1≦SGI812/(SGI812+TP8)≦0.6; 0.1≦SGI822/(SGI822+TP8)≦0.6.

The vertical distance between the inflection point of the optical axis and the optical axis of the side surface of the eighth lens object is represented by HIF811, and the intersection angle of the eighth lens image side on the optical axis to the optical axis of the optical axis of the eighth lens image side and the optical axis The vertical distance between them is expressed by HIF821, which satisfies the following conditions: 0.001 mm ≦ | HIF811 | ≦ 7.5 mm; 0.001 mm ≦ | HIF821 | ≦ 7.5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦|HIF811|≦5 mm; 0.1 mm ≦|HIF821|≦5 mm.

The vertical distance between the inflection point of the second lens object near the optical axis and the optical axis is represented by HIF812, and the intersection of the eighth lens image side on the optical axis and the second lens image side is close to the optical axis. The vertical distance between the point and the optical axis is represented by HIF822, which satisfies the following conditions: 0.001 mm ≦ | HIF 812 | ≦ 7.5 mm; 0.001 mm ≦ | HIF 822 | ≦ 7.5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦|HIF822|≦6 mm; 0.1 mm ≦|HIF812|≦6 mm.

The vertical distance between the inflection point of the third lens object near the optical axis and the optical axis is represented by HIF813, and the intersection of the eighth lens image side on the optical axis and the third lens image side is close to the optical axis. The vertical distance between the point and the optical axis is represented by HIF823, which satisfies the following conditions: 0.001 mm ≦ | HIF 813 | ≦ 7.5 mm; 0.001 mm ≦ | HIF 823 | ≦ 7.5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦ | HIF823 | ≦ 7 mm; 0.1 mm ≦ | HIF 813 | ≦ 7 mm.

The vertical distance between the inflection point of the fourth lens side near the optical axis and the optical axis is represented by HIF814, and the intersection of the eighth lens image side on the optical axis and the eighth lens image side is close to the optical axis. The vertical distance between the point and the optical axis is represented by HIF 824, which satisfies the following conditions: 0.001 mm ≦ | HIF 814 | ≦ 7.5 mm; 0.001 mm ≦ | HIF 824 | ≦ 7.5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦|HIF824|≦7.25 mm; 0.1 mm ≦|HIF814|≦7.25 mm.

One embodiment of the optical imaging system of the present invention can aid in the correction of chromatic aberrations in an optical imaging system by staggering the lenses having a high dispersion coefficient and a low dispersion coefficient.

The above aspheric equation is: z=ch2/[1(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+... (1) where z is a position value with reference to the surface apex at a position of height h in the optical axis direction, k is a cone coefficient, c is a reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 And A20 is a high-order aspheric coefficient.

In the optical imaging system provided by the present invention, the material of the lens may be plastic or glass. When the lens is made of plastic, it can effectively reduce production cost and weight. In addition, when the lens is made of glass, it can control the thermal effect and increase the design space of the optical imaging system's refractive power configuration. In addition, the object side and the image side of the first lens to the eighth lens in the optical imaging system may be aspherical, which can obtain more control variables, in addition to reducing aberrations, even compared to the use of conventional glass lenses. The number of lenses used can be reduced, thus effectively reducing the overall height of the optical imaging system of the present invention.

Furthermore, in the optical imaging system provided by the present invention, if the surface of the lens is convex, in principle, the surface of the lens is convex at the near optical axis; if the surface of the lens is concave, the surface of the lens is in principle indicated at the near optical axis. Concave.

The optical imaging system of the present invention is more applicable to the optical system of moving focus, and has the characteristics of excellent aberration correction and good imaging quality, thereby expanding the application level.

The optical imaging system of the present invention further includes a drive module that can be coupled to the lenses and cause displacement of the lenses. The aforementioned driving module may be a voice coil motor (VCM) for driving the lens to focus, or an optical anti-vibration element (OIS) for reducing the frequency of defocus caused by lens vibration during the shooting process.

The optical imaging system of the present invention further requires at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens to have a wavelength of less than 500 nm. A light filtering component is achieved by coating a surface of at least one surface of the lens having the specific filtering function or the lens itself is made of a material having a short wavelength.

The imaging surface of the optical imaging system of the present invention is more or less selected as a plane or a curved surface. When the imaging surface is a curved surface (for example, a spherical surface having a radius of curvature), it helps to reduce the incident angle required to focus the light on the imaging surface, in addition to helping to achieve the length (TTL) of the miniature optical imaging system, Illumination also helps.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the light of the above-described embodiments, the specific embodiments are described below in detail with reference to the drawings.

First embodiment

Please refer to FIG. 1A and FIG. 1B , wherein FIG. 1A is a schematic diagram of an optical imaging system according to a first embodiment of the present invention. FIG. 1B is a left-to-right sequential optical imaging system of the first embodiment. Spherical aberration, astigmatism and optical distortion curves. FIG. 1C is a diagram showing a visible light spectrum modulation conversion characteristic diagram of the embodiment. 1D is a first perspective view of the visible light spectrum of the embodiment of the present invention, a 0.3 field of view, a 0.7 field of view defocus modulation conversion contrast transfer rate map (Through Focus MTF); The center field of the infrared light spectrum of the embodiment, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate map. As can be seen from FIG. 1A, the optical imaging system sequentially includes the first lens 110, the aperture 100, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 from the object side to the image side. The seventh lens 170 and the eighth lens 180, the infrared filter 190, the imaging surface 192, and the image sensing element 194.

The first lens 110 has a negative refractive power and is made of a plastic material. The object side surface 112 is a convex surface, and the image side surface 114 is a concave surface, and both are aspherical surfaces. The thickness of the first lens on the optical axis is TP1, and the thickness of the first lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP1.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the first lens object on the optical axis and the inversion point of the optical axis of the first lens object is represented by SGI 111, and the intersection of the side of the first lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the closest optical axis of the first lens image side is indicated by SGI121.

The intersection of the side of the first lens on the optical axis to the second side of the first lens The horizontal displacement distance between the inflection points of the near optical axis and the optical axis is represented by SGI 112, and the intersection of the first lens image side on the optical axis and the first lens image side and the second optical axis opposite to the optical axis The horizontal displacement distance in which the optical axes are parallel is represented by SGI122.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the first lens object is represented by HIF111, and the intersection point of the first lens image on the optical axis to the inflection point and the optical axis of the optical axis closest to the side of the first lens image The vertical distance between them is represented by HIF121.

The vertical distance between the inflection point of the second lens object near the optical axis and the optical axis is represented by HIF 112, and the intersection of the side of the first lens image on the optical axis to the second of the first lens image is the closest to the optical axis. The vertical distance between the curved point and the optical axis is represented by HIF122.

The second lens 120 has a positive refractive power and is made of a plastic material. The object side surface 122 is a convex surface, and the image side surface 124 is a convex surface, and both are aspherical surfaces. The thickness of the second lens on the optical axis is TP2, and the thickness of the second lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP2.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the second lens object on the optical axis and the inversion point of the optical axis of the second lens object is represented by SGI211, and the intersection of the side of the second lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the second lens image side is indicated by SGI221.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the second lens object is represented by HIF211, and the intersection of the second lens image side on the optical axis and the optical axis of the optical axis near the side of the second lens image The vertical distance between them is indicated by HIF221.

The third lens 130 has a positive refractive power and is made of a plastic material. The object side surface 132 is a convex surface, and the image side surface 134 is a concave surface, and both are aspherical surfaces, and the object side surface 142 and the image side surface 134 each have an inflection point. The thickness of the third lens on the optical axis is TP3, and the thickness of the third lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP3.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the third lens object on the optical axis and the inversion point of the optical axis of the third lens object is represented by SGI311, and the intersection of the side of the third lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the third lens image side is represented by SGI321, which satisfies the following condition: SGI311=0.3764mm; |SGI311|/(|SGI311|+TP3)=0.1428; SGI321=0.0129 mm; |SGI321|/(|SGI321|+TP3)=0.0057.

The intersection of the side of the third lens on the optical axis to the second side of the third lens The horizontal displacement distance between the inflection points of the near optical axis and the optical axis is represented by SGI 312, and the intersection of the third lens image side on the optical axis and the second lens image side near the optical axis The horizontal displacement distance in which the optical axes are parallel is indicated by SGI322.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the third lens object is represented by HIF311, and the intersection of the third lens image side on the optical axis and the optical axis of the optical axis near the side of the third lens image The vertical distance between them is represented by HIF321, which satisfies the following conditions: HIF311=4.4550 mm; HIF311/HOI=0.5940; HIF321=1.3867 mm; HIF321/HOI=0.1849.

The vertical distance between the inflection point of the second lens side near the optical axis and the optical axis is represented by HIF 312, and the intersection of the third lens image side on the optical axis to the third lens image side and the second optical axis is reversed. The vertical distance between the point and the optical axis is indicated by HIF322.

The fourth lens 140 has a negative refractive power and is made of a plastic material. The object side surface 142 is a concave surface, and the image side surface 144 is a concave surface, and both are aspherical. The thickness of the fourth lens on the optical axis is TP4, and the thickness of the fourth lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP4.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the fourth lens object on the optical axis and the inversion point of the optical axis of the fourth lens object is indicated by SGI411, and the intersection of the side of the fourth lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the fourth lens image side is indicated by SGI421.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the fourth lens object on the optical axis to the inflection point of the second lens object and the second optical axis is represented by SGI 412, and the side of the fourth lens image is on the optical axis. The horizontal displacement distance parallel to the optical axis between the intersection point and the inflection point of the second lens image side of the fourth lens image side is indicated by SGI422.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the fourth lens object is represented by HIF411, and the intersection of the fourth lens image side on the optical axis and the optical axis of the optical axis near the side of the fourth lens image The vertical distance between them is indicated by HIF421.

The vertical distance between the inflection point of the second lens object near the optical axis and the optical axis is represented by HIF412, and the intersection of the fourth lens image side on the optical axis to the fourth lens image side and the second optical axis is reversed. The vertical distance between the point and the optical axis is represented by HIF422.

The fifth lens 150 has a positive refractive power and is made of a plastic material. The object side surface 152 is a convex surface, and the image side surface 154 is a convex surface, and both are aspherical surfaces, and the image side surface 154 has an inverse surface. Curved point. The thickness of the fifth lens on the optical axis is TP5, and the thickness of the fifth lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP5.

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the fifth lens object on the optical axis and the inversion point of the optical axis of the fifth lens object is indicated by SGI 511, and the intersection of the side of the fifth lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the fifth lens image side is represented by SGI521, which satisfies the following condition: SGI521=-0.0777mm; |SGI521|/(|SGI521|+TP5)=0.0296 .

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the fifth lens object on the optical axis and the inversion point of the second lens object near the optical axis is represented by SGI 512, and the side of the fifth lens image is on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the inflection point of the second near-optical axis of the fifth lens image side is indicated by SGI 522.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the fifth lens object is represented by HIF 511, and the vertical distance between the inflection point of the optical axis of the fifth lens image and the optical axis is represented by HIF521, which satisfies the following conditions : HIF521 = 2.1725 mm; HIF521 / HOI = 0.2897.

The vertical distance between the inflection point of the second lens side near the optical axis and the optical axis is represented by HIF 512, and the vertical distance between the inflection point of the second lens image side and the optical axis of the second optical axis is represented by HIF 522.

The sixth lens 160 has a positive refractive power and is made of a plastic material. The object side surface 162 is a convex surface, and the image side surface 164 is a concave surface, and the object side surface 162 and the image side surface 164 each have an inflection point. Thereby, the angle at which each field of view is incident on the sixth lens can be effectively adjusted to improve the aberration. The thickness of the sixth lens on the optical axis is TP6, and the thickness of the sixth lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP6.

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the sixth lens object on the optical axis and the inversion point of the optical axis of the sixth lens object is represented by SGI 611, and the intersection of the side of the sixth lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the sixth lens image side is represented by SGI621, which satisfies the following condition: SGI621=0.3579 mm; |SGI621|/(|SGI621|+TP6)=0.0867.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the sixth lens object is represented by HIF 611, and the vertical distance between the inflection point of the optical axis of the sixth lens image and the optical axis is represented by HIF621, which satisfies the following conditions : HIF621 = 6.3642 mm; HIF621 / HOI = 0.8486.

The seventh lens 170 has a positive refractive power and is made of a plastic material. The object side surface 172 is a convex surface, and the image side surface 174 is a convex surface. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the image side 174 has an inflection point. The thickness of the seventh lens on the optical axis is TP7, and the thickness of the seventh lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP7.

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the seventh lens object on the optical axis and the inversion point of the optical axis of the seventh lens object is represented by SGI711, and the intersection of the side of the seventh lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the closest optical axis of the seventh lens image side is represented by SGI721, which satisfies the following condition: SGI721=-0.0364mm; |SGI721|/(|SGI721|+TP7)=0.0111 .

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the seventh lens object is represented by HIF711, and the vertical distance between the inflection point of the optical axis of the seventh lens image and the optical axis is represented by HIF721, which satisfies the following conditions : HIF721 = 2.5166 mm; HIF721 / HOI = 0.3355.

The eighth lens 180 has a negative refractive power and is made of a plastic material. The object side surface 182 is a concave surface, and the image side surface 184 is a concave surface. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. The thickness of the eighth lens on the optical axis is TP8, and the thickness of the seventh lens at the height of the 1/2 incident pupil diameter (HEP) is represented by ETP8.

a horizontal displacement distance parallel to the optical axis between the intersection of the side of the eighth lens object on the optical axis and the inversion point of the optical axis of the eighth lens object is represented by SGI811, and the intersection of the side of the eighth lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the closest optical axis of the eighth lens image side is indicated by SGI821.

The vertical distance between the inflection point of the optical axis and the optical axis of the optical lens on the side of the eighth lens object is represented by HIF811, and the vertical distance between the inflection point of the optical axis of the eighth lens image and the optical axis is represented by HIF821.

In this embodiment, the distance from the coordinate point of the 1/2 HEP height on the side of the first lens to the optical axis is ETL, and the coordinate point of the height of 1/2 HEP on the side of the first lens to the first lens The horizontal distance between the coordinate points on the side of the eight lens image at a height of 1/2 HEP parallel to the optical axis is EIN, which satisfies the following conditions: ETL = 51.501 mm; EIN = 46.863 mm; EIN / ETL = 0.910.

This embodiment satisfies the following conditions, ETP1=3.556mm; ETP2=3.685mm; ETP3=2.169mm; ETP4=2.302mm; ETP5=2.260mm; ETP6=3.565mm; ETP7 = 3.104 mm; ETP8 = 1.002 mm. The sum of the aforementioned ETP1 to ETP8 is SETP=21.644 mm. TP1=3.180mm; TP2=3.990mm; TP3=2.259mm; TP4=1.878mm; TP5=2.551mm; TP6=3.772mm; TP7=3.236mm; TP8=0.927mm; the sum of the aforementioned TP1 to TP8 STP=21.794mm . SETP/STP=0.993. SETP/EIN=0.462.

This embodiment is to specifically control the proportional relationship between the thickness (ETP) of each lens at the height of 1/2 incident pupil diameter (HEP) and the thickness (TP) of the lens on the optical axis (ETP/TP). To achieve a balance between manufacturability and corrected aberration ability, which satisfies the following conditions, ETP1/TP1=1.118; ETP2/TP2=0.924; ETP3/TP3=0.960; ETP4/TP4=1.226; ETP5/TP5=0.886; ETP6 /TP6=0.945; ETP7/TP7=0.9595; ETP8/TP8=1.080.

In this embodiment, the horizontal distance between each adjacent two lenses at a height of 1/2 incident pupil diameter (HEP) is controlled to balance the length of the optical imaging system HOS "reduction", manufacturability, and correction aberration capability. In particular, controlling the proportional relationship between the horizontal distance (ED) of the adjacent two lenses at a height of 1/2 incident pupil diameter (HEP) and the horizontal distance (IN) of the adjacent two lenses on the optical axis (ED/IN) ), which satisfies the following condition, the horizontal distance parallel to the optical axis between the first lens and the second lens at a height of 1/2 incident pupil diameter (HEP) is ED12=22.059 mm; between the second lens and the third lens is 1 The horizontal distance of the /2 incident pupil diameter (HEP) height parallel to the optical axis is ED23=0.709 mm; the horizontal distance between the third lens and the fourth lens at the height of the 1/2 incident pupil diameter (HEP) parallel to the optical axis ED34=0.563mm; the horizontal distance parallel to the optical axis between the fourth lens and the fifth lens at the height of the 1/2 incident pupil diameter (HEP) is ED45=1.444mm; between the fifth lens and the sixth lens is 1/ 2 The horizontal distance parallel to the optical axis of the entrance pupil diameter (HEP) height is ED56 = 0.381 mm. The horizontal distance parallel to the optical axis between the sixth lens and the seventh lens at a height of 1/2 incident pupil diameter (HEP) is ED67=0.110 mm. The horizontal distance parallel to the optical axis between the seventh lens and the eighth lens at a height of 1/2 incident pupil diameter (HEP) is ED78 = 1.253 mm. The sum of the aforementioned ED12 to ED78 is represented by SED and SED = 25.219 mm.

The horizontal distance between the first lens and the second lens on the optical axis is IN12=22.350 mm, and ED12/IN12=0.987. The horizontal distance between the second lens and the third lens on the optical axis is IN23=0.480 mm, and ED23/IN23=0.2341.476. The horizontal distance between the third lens and the fourth lens on the optical axis is IN34=0.712 mm, and ED34/IN34=0.791. The horizontal distance between the fourth lens and the fifth lens on the optical axis is IN45=0.234 mm, and ED45/IN45=0.616. Fifth lens and sixth through The horizontal distance of the mirror on the optical axis is IN56=0.050 mm and ED56/IN56=7.630. The horizontal distance between the sixth lens and the seventh lens on the optical axis is IN67=0.050 mm, and ED67/IN67=2.192. The horizontal distance between the seventh lens and the eighth lens on the optical axis is IN78=1.278 mm, and ED78/IN78=0.981. The sum of the aforementioned IN12 to IN78 is represented by SIN and SIN = 8.418 mm. SED/SIN=1.003.

This embodiment further satisfies the following conditions: ED12/ED23=31.131; ED23/ED34=1.258; ED34/ED45=3.902; ED45/ED56=0.378; ED56/ED67=0.481; ED67/ED78=0.087; IN12/IN23=46.552; IN23 /IN34=0.675; IN34/IN45=3.036; IN45/IN56=4.689; IN56/IN67=1.000; IN67/IN78=0.039.

The horizontal distance from the coordinate point of the 1/2 HEP height on the side of the eighth lens image to the optical axis parallel to the optical axis is EBL=4.638 mm, and the intersection of the eighth lens image side and the optical axis to the imaging surface The horizontal distance parallel to the optical axis is BL = 4.6574 mm, and an embodiment of the present invention can satisfy the following formula: EBL/BL = 0.9958. In the eighth lens image side of the embodiment, the distance between the coordinate point of the 1/2 HEP height and the infrared filter is parallel to the optical axis is EIR=0.980 mm, and the intersection of the eighth lens image side and the optical axis to the infrared The distance between the filters parallel to the optical axis is PIR = 1.000 mm, and the following formula is satisfied: EIR / PIR = 0.980.

The following description of the present embodiment and the inflection point related features are obtained based on the main reference wavelength of 555 nm.

The infrared filter 190 is made of glass and is disposed between the eighth lens 180 and the imaging surface 192 without affecting the focal length of the optical imaging system.

In the optical imaging system of the embodiment, the focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the half of the maximum viewing angle in the optical imaging system is HAF, and the values are as follows: f=5.3947 mm; f/HEP =1.2; and HAF = 55 degrees.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens having a positive refractive power, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens having a negative refractive power, optical imaging of the present embodiment In the system, the sum of the PPRs of all positive refractive power lenses is Σ PPR, and the sum of the NPRs of all negative refractive power lenses is Σ NPR. The following conditions are also satisfied: |f/f1|=0.4204;|f/f2|=0.3695;|f/f3|=0.0986;|f/f4|=0.6333;|f/f5|=0.3560;|f/f6 |=0.2635; |f/f7|=0.1252;|f/f8|=0.0715.

In the optical imaging system of the embodiment, the first lens object side 112 to the eighth The distance between the lens image side surface 174 is InTL, the distance between the first lens object side surface 112 and the imaging surface 192 is HOS, the distance between the aperture 100 and the imaging surface 192 is InS, and the image sensing element 194 effectively senses the area diagonal. The longer half is HOI, and the distance between the eighth lens image side 184 and the imaging surface 192 is BFL, which satisfies the following conditions: InTL+BFL=HOS; HOS=51.6062 mm; InTL=46.9488 mm; HOI=7.5 mm; HOS/ HOI=6.8808; HOS/f=9.5661; InS=24.2924 mm; and InS/HOS=0.4707.

In the optical imaging system of the present embodiment, the sum of the thicknesses of all the refractive power lenses on the optical axis is Σ TP, which satisfies the following conditions: TP TP = 21.7939 mm; and Σ TP / InTL = 0.4642. Thereby, the contrast of the system imaging and the yield of the lens manufacturing can be simultaneously taken into consideration and an appropriate back focus can be provided to accommodate other components.

In the optical imaging system of the present embodiment, the sum of the focal lengths of all lenses having positive refractive power is Σ PP, which satisfies the following conditions: Σ PP = f2 + f3 + f5 + f6 + f7 = 148.01 mm; and f2 / (f2 + F3+f5+f6+f7)=0.0986. Thereby, it is helpful to appropriately distribute the positive refractive power of the second lens 120 to other positive lenses to suppress the generation of significant aberrations during the traveling of the incident light.

In the optical imaging system of the present embodiment, the sum of the focal lengths of all lenses having negative refractive power is Σ NP, which satisfies the following conditions: NP NP = f1 + f4 + f8 = -96.8161 mm; and f1/(f1 + f3 + f6 ) = 0.1325. Thereby, it is helpful to appropriately distribute the negative refractive power of the eighth lens to the other negative lenses to suppress the generation of significant aberrations during the traveling of the incident light.

In the optical imaging system of the present embodiment, the distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which satisfies the following conditions: IN12=22.3504 mm; IN12/f=4.1430. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of the present embodiment, the thicknesses of the first lens 110 and the second lens 120 on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: TP1=3.1800 mm; TP2=3.9903 mm; and (TP1+IN12) ) /TP2 = 6.3981. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

In the optical imaging system of the embodiment, the thicknesses of the sixth lens 160, the seventh lens 160, and the eighth lens 180 on the optical axis are TP6, TP7, and TP8, respectively, and the sixth lens 160 and the seventh lens 160 are on the optical axis. The upper separation distance is IN67, and the distance between the seventh lens 160 and the eighth lens 180 on the optical axis is IN78, which satisfies the following conditions: TP6=3.7720mm; TP7=3.2362mm; TP8=0.9274mm; and (TP8+ IN78) / TP7 = 0.6815. With this, Helps control the sensitivity of optical imaging system manufacturing and reduce the overall height of the system.

In the optical imaging system of the embodiment, the thicknesses of the third lens 130, the fourth lens 140, and the fifth lens 150 on the optical axis are TP3, TP4, and TP5, respectively, and the third lens 130 and the fourth lens 140 are on the optical axis. The spacing distance is IN34, the distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, and the distance between the first lens object side 112 to the eighth lens image side surface 174 is InTL, which satisfies the following condition: TP3 = 2.2593 mm; TP4 = 1.8776 mm; TP5 = 2.5511 mm; IN34 = 0.7118 mm; IN45 = 0.2345 mm; and (TP3 + TP4 + TP5) / TP TP = 0.3069. Thereby, it helps the layer to slightly correct the aberration generated by the incident light ray and reduce the total height of the system.

In the optical imaging system of the embodiment, the horizontal displacement distance of the seventh lens object side surface 172 on the optical axis to the seventh lens object side surface 172 is the horizontal displacement distance of the optical axis is InRS71, and the seventh lens image side surface 174 is The horizontal effective displacement distance from the intersection of the intersection of the optical axis to the seventh lens image side surface 174 to the optical axis is InRS72, and the thickness of the seventh lens 170 on the optical axis is TP7, which satisfies the following condition: InRS71=2.7049 mm; InRS72=0.3270mm; and |InRS72|/TP7=0.1010. Thereby, it is advantageous for the production and molding of the lens, and the miniaturization thereof is effectively maintained.

In the optical imaging system of the embodiment, the vertical distance between the critical point of the seventh lens object side surface 172 and the optical axis is HVT71, and the vertical distance between the critical point of the seventh lens image side surface 174 and the optical axis is HVT72, which satisfies the following conditions: HVT71 = 0 mm; HVT72 = 3.7869 mm; and HVT71 / HVT72 = 0.

In the optical imaging system of the embodiment, the horizontal displacement distance of the eighth lens object side surface 182 from the intersection of the optical axis to the eighth lens object side surface 182 is the horizontal displacement distance of the optical axis is InRS81, and the eighth lens image side 184 is The horizontal effective displacement distance from the intersection point on the optical axis to the eighth lens image side surface 184 on the optical axis is InRS82, and the thickness of the eighth lens 180 on the optical axis is TP8, which satisfies the following condition: InRS81=-0.8396 mm ;InRS82=0.9232mm; and |InRS82|/TP8=0.9954. Thereby, it is advantageous for the production and molding of the lens, and the miniaturization thereof is effectively maintained.

In the optical imaging system of the embodiment, the vertical distance between the critical point of the eighth lens object side surface 182 and the optical axis is HVT81, and the vertical distance between the critical point of the eighth lens image side surface 184 and the optical axis is HVT82, which satisfies the following conditions: HVT81 = 0 mm; HVT82 = 0 mm.

In the optical imaging system of the present embodiment, the TV distortion of the optical imaging system at the time of image formation is TDT, and the optical distortion at the time of image formation is ODT, which satisfies the following conditions: TDT=1.9874%; ODT=-4.6109%.

The light of any field of view of the embodiment of the present invention can be further divided into sagittal ray and tangential ray, and the basis of the focus offset and the MTF value is the spatial frequency of 110 cycles/mm. The focus offset of the defocusing MTF maximum of the visible light center field of view, the 0.3 field of view, and the 0.7 field of view of the sagittal plane ray is represented by VSFS0, VSFS3, and VSFS7 (measurement unit: mm), and their values are 0.000 mm, 0.000, respectively. Mm, 0.010mm; the maximum defocusing MTF of the sagittal plane of the visible field, 0.3 field of view, and 0.7 field of view are represented by VSMTF0, VSMTF3, and VSMTF7, respectively, and their values are 0.667, 0.717, and 0.418, respectively; The focus shift of the defocusing MTF maximum of the meridional plane light of 0.3 field of view and 0.7 field of view is represented by VTFS0, VTFS3, and VTFS7 (measurement unit: mm), and the values are respectively 0.000mm, 0.000mm, 0.000mm. The maximum defocus MTF of the visible light center field of view, the 0.3 field of view, and the 0.7 field of view of the meridional plane light are represented by VTMTF0, VTMTF3, and VTMTF7, respectively, and their values are 0.667, 0.345, and 0.343, respectively. The average focus offset (position) of the aforementioned visible light sagittal three-field and the focal displacement of the three-field of the visible light meridional plane is expressed in AVFS (unit of measure: mm), which satisfies the absolute value | (VSFS0+VSFS3+VSFS7+ VTFS0+VTFS3+VTFS7)/6|=|0.002mm|.

The focus shift amount of the defocusing MTF maximum value of the infrared light center field of view, the 0.3 field of view, and the 0.7 field of view of the sagittal plane ray of the present embodiment is represented by ISFS0, ISFS3, and ISFS7 (measured in mm), respectively. The average focus shift (position) of the focal shift of the three fields of view of the sagittal plane is represented by AISFS; the infrared center of the field of view, the 0.3 field of view, and the 0.7 field of view of the sagittal plane are 0.050 mm, 0.040 mm, and 0.060 mm. The maximum defocusing MTF of light is represented by ISMTF0, ISMTF3, and ISMTF7, respectively, and their values are 0.768, 0.785, and 0.382, respectively; the infrared field center field of view, the 0.3 field of view, and the 0.7 field of view of the meridional surface of the meridian plane are the maximum value of the defocusing MTF. The focus offsets are represented by ITFS0, ITFS3, and ITFS7 (measured in mm), and their values are 0.050, 0.050, and 0.080, respectively. The average focus offset (position) of the focus shift of the three fields of view of the meridional plane is AITFS indicates (measurement unit: mm); the defocusing MTF maximum values of the infrared light center field of view, 0.3 field of view, and 0.7 field of view of the meridional plane light are represented by ITMTF0, ITMTF3, and ITMTF7, respectively, and their values are 0.768, 0.714, and 0.441, respectively. . The aforementioned infrared light sagittal plane three field of view and the infrared photon meridian three field of view The average focus offset (position) of the focus offset is expressed in AIFS (unit of measure: mm), which satisfies the absolute value |(ISFS0+ISFS3+ISFS7+ITFS0+ITFS3+ITFS7)/6|=|0.055mm|.

In this embodiment, the focus shift between the visible light center field focus point and the infrared light center field focus point (RGB/IR) of the entire optical imaging system is represented by FS (ie, wavelength 850 nm versus wavelength 555 nm, unit of measure: mm) , which satisfies the absolute value |(VSFS0+VTFS0)/2-(ISFS0+ITFS0)/2|=|0.050mm|; the visible light three-field average focus offset and the infrared three-field average focus of the entire optical imaging system The difference between the offsets (RGB/IR) (focus offset) is expressed in AFS (ie wavelength 850 nm versus wavelength 555 nm, unit of measure: mm), which satisfies the absolute value |AIFS-AVFS|=|0.053mm| .

In the optical imaging system of the embodiment, the optical axis of the visible light, the 0.3HOI, and the 0.7HOI three are at a spatial frequency of 55 cycles/mm, and the modulation conversion contrast ratio (MTF value) is represented by MTFE0, MTFE3, and MTFE7, respectively. It satisfies the following conditions: MTFE0 is about 0.85; MTFE3 is about 0.69; and MTFE7 is about 0.63. The modulation conversion contrast transfer rate (MTF value) of the visible light on the imaging plane, the optical axis of 0.3HOI and 0.7HOI at the spatial frequency of 110 cycles/mm, is represented by MTFQ0, MTFQ3 and MTFQ7, respectively, which satisfy the following conditions: MTFQ0 is about 0.67. ; MTFQ3 is about 0.35; and MTFQ7 is about 0.35. The modulation conversion contrast transfer rate (MTF value) of the optical axis, 0.3 HOI, and 0.7 HOI at the spatial frequency of 220 cycles/mm on the imaging plane is represented by MTFH0, MTFH3, and MTFH7, respectively, which satisfy the following condition: MTFH0 is about 0.35; MTFH3 is about 0.15; and MTFH7 is about 0.28.

Refer to Table 1 and Table 2 below for reference.

Table 1 is the detailed structural data of the first embodiment of Fig. 1, in which the unit of curvature radius, thickness, distance, and focal length is mm, and the surfaces 0-16 sequentially represent the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, wherein the cone surface coefficients in the a-spherical curve equation of k, and A1-A20 represent the first--20th-order aspheric coefficients of each surface. In addition, the following table of the embodiments corresponds to the schematic diagram and the aberration diagram of the respective embodiments, and the definitions of the data in the table are the same as those of the first embodiment and the second embodiment, and are not described herein.

Second embodiment

Please refer to FIG. 2A and FIG. 2B , wherein FIG. 2A is a schematic diagram of an optical imaging system according to a second embodiment of the present invention, and FIG. 2B is a left-to-right sequential optical imaging system of the second embodiment. Spherical aberration, astigmatism and optical distortion curves. Figure 2C is a lateral aberration diagram of the optical imaging system of the second embodiment at 0.7 field of view. 2D is a decentralized modulation conversion contrast transfer rate map of the visible light spectrum of the present embodiment, a 0.3 field of view, and a 0.7 field of view; and FIG. 2E is a diagram showing the infrared light spectrum of the second embodiment of the present invention. The central field of view, the 0.3 field of view, and the 0.7 field of view defocus modulation conversion contrast transfer rate map. As can be seen from FIG. 2A, the optical imaging system sequentially includes the first lens 210, the second lens 220, the third lens 230, the aperture 200, the fourth lens 240, the fifth lens 250, and the sixth lens 260 from the object side to the image side. The seventh lens 270 and the eighth lens 280, the infrared filter 290, the imaging surface 292, and the image sensing element 294.

The first lens 210 has a negative refractive power and is made of a plastic material. The object side surface 212 is a concave surface, and the image side surface 214 is a concave surface, and both are aspherical surfaces, and the object side surface 212 has two inflection points.

The second lens 220 has a negative refractive power and is made of a plastic material. The object side surface 222 is a concave surface, and the image side surface 224 is a convex surface, and both are aspherical surfaces, and the object side surface 222 has an inflection point.

The third lens 230 has a positive refractive power and is made of a plastic material. The object side surface 232 is a convex surface, and the image side surface 234 is a convex surface, and both are aspherical surfaces. The object side surface 232 has an inflection point and the image side surface 234 has two opposite ends. Curved point.

The fourth lens 240 has a positive refractive power and is made of a plastic material. The object side surface 242 is a convex surface, and the image side surface 244 is a convex surface, and both are aspherical surfaces, and the object side surface 242 has an inflection point.

The fifth lens 250 has a positive refractive power and is made of a plastic material. The object side surface 252 is a concave surface, and the image side surface 254 is a convex surface, and both are aspherical surfaces.

The sixth lens 260 has a negative refractive power and is made of a plastic material. The object side surface 262 is a concave surface, and the image side surface 264 is a concave surface, and both are aspherical. Thereby, the angle at which each field of view is incident on the sixth lens 260 can be effectively adjusted to improve the aberration.

The seventh lens 270 has a positive refractive power and is made of a plastic material. The object side surface 272 is a convex surface, and the image side surface 274 is a convex surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the angle of incidence of the off-axis field of view light can be effectively suppressed, and the aberration of the off-axis field of view can be further corrected.

The eighth lens 280 has a positive refractive power and is made of a plastic material. The object side surface 282 is a convex surface, and the image side surface 284 is a concave surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the eighth lens object side surface 282 and the image side surface 284 each have an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 290 is made of glass and is disposed between the eighth lens 280 and the imaging surface 292 without affecting the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

In the second embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

According to Tables 3 and 4, the following conditional values can be obtained:

According to Tables 3 and 4, the following conditional values can be obtained:

Third embodiment

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of an optical imaging system according to a third embodiment of the present invention, and FIG. 3B is a left-to-right sequential optical imaging system of the third embodiment. Spherical aberration, astigmatism and optical distortion curves. Figure 3C is a lateral aberration diagram of the optical imaging system of the third embodiment at 0.7 field of view. 3D is a decentralized modulation conversion contrast transfer rate map of the visible light spectrum of the present embodiment, a 0.3 field of view, and a 0.7 field of view; FIG. 3E is a central view of the infrared light spectrum of the embodiment. Field, 0.3 field of view, 0.7 field of view defocus modulation conversion contrast transfer rate map. As can be seen from FIG. 3A, the optical imaging system sequentially includes the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the aperture 300, the fifth lens 350, and the sixth lens 360 from the object side to the image side. The seventh lens 370 and the eighth lens 380, the infrared filter 390, the imaging surface 392, and the image sensing element 394

The first lens 310 has a negative refractive power and is made of a plastic material. The object side surface 312 is a convex surface, and the image side surface 314 is a concave surface, and both are aspherical surfaces, and the object side surface 312 has an inflection point.

The second lens 320 has a negative refractive power and is made of a plastic material. The object side surface 322 is a concave surface, and the image side surface 324 is a concave surface, and both are aspherical surfaces, and the object side surface 322 has an inflection point.

The third lens 330 has a positive refractive power and is made of a plastic material. The object side surface 332 is a concave surface, and the image side surface 334 is a convex surface, and both are aspherical surfaces.

The fourth lens 340 has a positive refractive power and is made of a plastic material. The object side surface 342 is a convex surface, and the image side surface 344 is a convex surface, and both are aspherical surfaces, and the object side surface 342 has an inflection point.

The fifth lens 350 has a positive refractive power and is made of a plastic material. The object side surface 352 is a convex surface, and the image side surface 354 is a convex surface, and both are aspherical.

The sixth lens 360 has a negative positive force and is made of a plastic material. The object side surface 362 is a concave surface, and the image side surface 364 is a concave surface, and both are aspherical. Thereby, the angle at which each field of view is incident on the sixth lens 360 can be effectively adjusted to improve the aberration.

The seventh lens 370 has a positive refractive power and is made of a plastic material. The object side surface 372 is a convex surface, and the image side surface 374 is a concave surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the angle of incidence of the off-axis field of view light can be effectively suppressed, and the aberration of the off-axis field of view can be further corrected.

The eighth lens 380 has a positive refractive power and is made of a plastic material. The object side surface 382 is a convex surface, and the image side surface 384 is a concave surface, and both are aspherical surfaces. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the eighth lens object side surface 382 and the image side surface 384 each have an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 390 is made of glass and is disposed between the eighth lens 380 and the imaging surface 392 without affecting the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

In the third embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

According to Tables 5 and 6, the following conditional values can be obtained:

According to Tables 5 and 6, the following conditional values can be obtained:

Fourth embodiment

Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic diagram of an optical imaging system according to a fourth embodiment of the present invention, and FIG. 4B is a left-to-right sequential optical imaging system of the fourth embodiment. Spherical aberration, astigmatism and optical distortion curves. Figure 4C is a lateral aberration diagram of the optical imaging system of the fourth embodiment at a field of view of 0.7. 4D is a decentralized modulation conversion contrast transfer rate map of the visible light spectrum of the present embodiment, a 0.3 field of view, and a 0.7 field of view; FIG. 4E is a central view of the infrared light spectrum of the embodiment. Field, 0.3 field of view, 0.7 field of view defocus modulation conversion contrast transfer rate map. As can be seen from FIG. 4A, the optical imaging system sequentially includes the first lens 410, the second lens 420, the third lens 430, the aperture 400, the fourth lens 440, the fifth lens 450, and the sixth lens 460 from the object side to the image side. The seventh lens 470 and the eighth lens 480, the infrared filter 490, the imaging surface 492, and the image sensing element 494.

The first lens 410 has a negative refractive power and is made of a plastic material. The object side surface 412 is a convex surface, and the image side surface 414 is a concave surface, and both are aspherical surfaces, and the object side surface 412 has an inflection point.

The second lens 420 has a negative refractive power and is made of a plastic material. The object side surface 422 is a concave surface, and the image side surface 424 is a concave surface, and both are aspherical surfaces, and the object side surface 422 has an inflection point.

The third lens 430 has a positive refractive power and is made of a plastic material. The object side surface 432 is a convex surface, and the image side surface 434 is a convex surface, and both are aspherical surfaces, and the object side surface 432 and the image side surface 444 each have an inflection point.

The fourth lens 440 has a positive refractive power and is made of a plastic material. The object side surface 442 is a convex surface, and the image side surface 444 is a convex surface, and both are aspherical.

The fifth lens 450 has a positive refractive power and is made of a plastic material. The object side surface 452 is a convex surface, and the image side surface 454 is a convex surface, and both are aspherical.

The sixth lens 460 has a negative refractive power and is made of a plastic material. The object side surface 462 is a concave surface, and the image side surface 464 is a concave surface, and both are aspherical surfaces. Thereby, the angle at which each field of view is incident on the sixth lens 460 can be effectively adjusted to improve the aberration.

The seventh lens 470 has a positive refractive power and is made of a plastic material, and its object side 472 It is a convex surface, and its image side surface 474 is convex and is aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the seventh lens image side surface 474 has an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The eighth lens 480 has a positive refractive power and is made of a plastic material. The object side surface 482 is a convex surface, and the image side surface 484 is a concave surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the eighth lens side surface 482 and the image side surface 484 each have an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 490 is made of glass and is disposed between the eighth lens 480 and the imaging surface 492 without affecting the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

In the fourth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

According to Tables 7 and 8, the following conditional values can be obtained:

According to Tables 7 and 8, the following conditional values can be obtained:

Fifth embodiment

Please refer to FIG. 5A and FIG. 5B , wherein FIG. 5A is a schematic diagram of an optical imaging system according to a fifth embodiment of the present invention, and FIG. 5B is a left-to-right sequential optical imaging system of the fifth embodiment. Spherical aberration, astigmatism and optical distortion curves. Figure 5C is a lateral aberration diagram of the optical imaging system of the fifth embodiment at 0.7 field of view. 5D is a decentralized modulation conversion contrast transfer rate map of the visible light spectrum of the present embodiment, a 0.3 field of view, and a 0.7 field of view; FIG. 5E is a central view of the infrared light spectrum of the embodiment. Field, 0.3 field of view, 0.7 field of view defocus modulation conversion contrast Rate chart. As can be seen from FIG. 5A, the optical imaging system sequentially includes the first lens 510, the second lens 520, the third lens 530, the fourth lens 540, the aperture 500, the fifth lens 550, and the sixth lens 560 from the object side to the image side. The seventh lens 570 and the eighth lens 580, the infrared filter 590, the imaging surface 592, and the image sensing element 594.

The first lens 510 has a negative refractive power and is made of a plastic material. The object side surface 512 is a convex surface, and the image side surface 514 is a concave surface, and both are aspherical.

The second lens 520 has a negative refractive power and is made of a plastic material. The object side surface 522 is a concave surface, and the image side surface 524 is a concave surface, and both are aspherical surfaces, and the object side surface 522 has an inflection point.

The third lens 530 has a positive refractive power and is made of a plastic material. The object side surface 532 is a convex surface, and the image side surface 534 is a convex surface, and both are aspherical surfaces. The object side surface 532 has an inflection point and the image side surface 3 has two opposite ends. Curved point.

The fourth lens 540 has a positive refractive power and is made of a plastic material. The object side surface 542 is a convex surface, and the image side surface 544 is a convex surface, and both are aspherical surfaces, and the object side surface 542 has an inflection point.

The fifth lens 550 has a positive refractive power and is made of a plastic material. The object side surface 552 is a convex surface, and the image side surface 554 is a convex surface, and both are aspherical surfaces.

The sixth lens 560 can have a negative refractive power and is made of a plastic material. The object side surface 562 is a concave surface, and the image side surface 564 is a concave surface, and both are aspherical. Thereby, the angle at which each field of view is incident on the sixth lens 560 can be effectively adjusted to improve the aberration.

The seventh lens 570 has a positive refractive power and is made of a plastic material. The object side surface 572 is a convex surface, and the image side surface 574 is a convex surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the seventh lens object side surface 572 has an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The eighth lens 580 has a positive refractive power and is made of a plastic material. The object side surface 582 is a convex surface, and the image side surface 584 is a convex surface, and both are aspherical. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the eighth lens image side surface 584 has an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 590 is made of glass and is disposed between the eighth lens 580 and the imaging surface 592 without affecting the focal length of the optical imaging system.

Please refer to the following list IX and Table 10.

In the fifth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

According to Table 9 and Table 10, the following conditional values can be obtained:

According to Table 9 and Table 10, the following conditional values can be obtained:

Sixth embodiment

Please refer to FIG. 6A and FIG. 6B , wherein FIG. 6A is a schematic diagram of an optical imaging system according to a sixth embodiment of the present invention, and FIG. 6B is a left-to-right sequential optical imaging system of the sixth embodiment. Spherical aberration, astigmatism and optical distortion curves. Figure 6C is a lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. 6D is a decentralized modulation conversion contrast transfer rate map of the visible light spectrum of the present embodiment, a 0.3 field of view, and a 0.7 field of view; FIG. 6E is a central view of the infrared light spectrum of the embodiment. Field, 0.3 field of view, 0.7 field of view defocus modulation conversion contrast transfer rate map. As can be seen from FIG. 6A, the optical imaging system sequentially includes the first lens 610, the second lens 620, the third lens 630, the fourth lens 640, the aperture 600, the fifth lens 650, and the sixth lens 660 from the object side to the image side. The seventh lens 670 and the eighth lens 680, the infrared filter 690, the imaging surface 692, and the image sensing element 694.

The first lens 610 has a negative refractive power and is made of glass. The object side surface 612 is a concave surface, the image side surface 614 is concave, and both are aspherical, and the object side surface 612 has an inflection point.

The second lens 620 has a negative refractive power and is made of glass. The object side surface 622 is a concave surface, the image side surface 624 is a concave surface, and both are aspherical surfaces, and the object side surface 622 has an inflection point.

The third lens 630 has a positive refractive power and is made of glass. The object side surface 632 is a concave surface, and the image side surface 634 is a convex surface, and both are aspherical surfaces, and the object side surface 632 has a reverse surface. Curved point.

The fourth lens 640 has a negative refractive power and is made of a plastic material. The object side surface 642 is a convex surface, and the image side surface 644 is a concave surface, and both are aspherical surfaces.

The fifth lens 650 has a positive refractive power and is made of glass. The object side surface 652 is a convex surface, and the image side surface 654 is a convex surface, and both are aspherical surfaces, and the object side surface 5 has an inflection point.

The sixth lens 660 has a negative refractive power and is made of a plastic material. The object side surface 662 is a concave surface, and the image side surface 664 is a concave surface, and the object side surface 662 and the image side surface 664 each have an inflection point. Thereby, the angle at which each field of view is incident on the sixth lens 660 can be effectively adjusted to improve the aberration.

The seventh lens 670 has a positive refractive power and is made of glass. The object side surface 672 is a concave surface, and the image side surface 674 is a convex surface, and both are aspherical surfaces. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the seventh lens object side surface 672 has two inflection points and the image side surface 674 has an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The eighth lens 680 has a positive refractive power and is made of glass. The object side surface 682 is a convex surface, and the image side surface 684 is a convex surface, and both are aspherical surfaces. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the eighth lens image side surface 684 has an inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 690 is made of glass and is disposed between the eighth lens 680 and the imaging surface 692 without affecting the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

In the sixth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

According to Table 11 and Table 12, the following conditional values can be obtained:

According to Table 11 and Table 12, the following conditional values can be obtained:

While the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and the invention may be modified and modified in various ways without departing from the spirit and scope of the invention. The scope is subject to the definition of the scope of the patent application.

The present invention has been particularly shown and described with reference to the exemplary embodiments thereof, and it is understood by those of ordinary skill in the art Various changes in form and detail can be made in the context of the category.

Claims (25)

  1. An optical imaging system comprising, from the object side to the image side, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; and a fourth lens having a refractive power a fifth lens having a refractive power; a sixth lens having a refractive power; a seventh lens having a refractive power; an eighth lens having a refractive power; and a first imaging surface; the system is a specific perpendicular to a visible light image plane of the optical axis and having a maximum value of the defocus modulation conversion contrast transfer rate (MTF) of the central field of view at the first spatial frequency; and a second imaging plane; the infrared light of a particular perpendicular to the optical axis a defocus modulation conversion contrast transfer ratio (MTF) having a maximum image plane and a central field of view at a first spatial frequency, wherein the optical imaging system has eight lenses having a refractive power, and the first lens to the eighth lens At least one lens has a positive refractive power, and the focal lengths of the first lens to the eighth lens are f1, f2, f3, f4, f5, f6, f7, and f8, respectively, and the optical imaging system has a focal length of f, and the optical imaging Incident of the lens system Diameter of the HEP, the first side surface to the first lens element having an imaging surface on the optical axis from the HOS, the object side surface of the first lens to the eighth lens image The side has a distance InTL on the optical axis, and the half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, the first imaging surface and the The distance between the second imaging planes on the optical axis is FS, and the thicknesses of the first lens to the eighth lens are 1/2 HEP and parallel to the optical axis are respectively ETP1, ETP2, ETP3, ETP4, ETP5, ETP6, ETP7 and ETP8, the sum of the foregoing ETP1 to ETP8 is SETP, and the thickness of the first lens to the eighth lens on the optical axis are TP1, TP2, TP3, TP4, TP5, TP6, TP7, and TP8, respectively, and the foregoing TP1 to TP8 The sum is STP, which satisfies the following conditions: 1.0 ≦ f / HEP ≦ 10.0; 0 deg < HAF ≦ 150 deg; 0.5 ≦ SETP / STP < 1 and | FS | ≦ 100 μm.
  2. The optical imaging system of claim 1, wherein the infrared light has a wavelength between 700 nm and 1300 nm and the first spatial frequency is represented by SP1, which satisfies the following condition: SP1 ≦ 440 cycles/mm.
  3. The optical imaging system of claim 1, wherein the optical axis of the visible light on the imaging plane, 0.3 HOI, and 0.7 HOI are at a spatial frequency of 55 cycles/mm, and the modulation conversion transfer rate (MTF value) is respectively MTFE0, MTFE3, and MTFE7 indicates that it satisfies the following conditions: MTFE0≧0.2; MTFE3≧0.01; and MTFE7≧0.01.
  4. The optical imaging system of claim 1, wherein the first lens to the eighth lens have a thickness of 1/2 HEP and a thickness parallel to the optical axis of ETP1, ETP2, ETP3, ETP4, ETP5, ETP6, ETP7, and ETP8, the sum of the aforementioned ETP1 to ETP8 is SETP, which satisfies the following formula: 0.3≦SETP/EIN<1.
  5. The optical imaging system of claim 1, wherein the optical imaging system comprises a filter element located between the eighth lens and the imaging surface, the eighth lens image being flanked by 1/2 HEP The height coordinate point to the distance between the filter elements parallel to the optical axis is EIR, and the distance between the intersection of the eighth lens image side and the optical axis to the optical axis parallel to the optical axis is PIR, which satisfies the following formula : 0.1 ≦ EIR / PIR ≦ 1.1.
  6. The optical imaging system of claim 1, wherein a horizontal distance from a coordinate point of the 1/2 HEP height on the side of the first lens to a horizontal axis parallel to the optical axis of the imaging surface is ETL on the side of the first lens The horizontal distance from the coordinate point of the 1/2 HEP height to the coordinate point of the 1/2 HEP height on the side of the eighth lens image parallel to the optical axis is EIN, which satisfies the following condition: 0.2 ≦ EIN / ETL < 1.
  7. The optical imaging system of claim 1, wherein the first lens has a negative refractive power.
  8. The optical imaging system of claim 1, wherein a horizontal distance from a coordinate point of the 1/2 HEP height on the side of the eighth lens image to the optical axis between the imaging planes is EBL, and the eighth lens image side is The horizontal distance from the intersection of the optical axis to the imaging plane parallel to the optical axis is BL, which satisfies the following formula: 0.1 ≦ EBL / BL ≦ 1.5.
  9. The optical imaging system of claim 1, further comprising an aperture, and having a distance InS from the aperture to the first imaging plane on the optical axis, which satisfies the following formula: 0.2 ≦ InS/HOS ≦ 1.1.
  10. An optical imaging system comprising, from the object side to the image side, in sequence: a first lens having a negative refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; and a sixth lens a refractive power; a seventh lens having a refractive power; an eighth lens having a refractive power; a first imaging surface; the visible image plane being perpendicular to the optical axis and having a central field of view The defocus modulation conversion contrast transfer rate (MTF) of the spatial frequency (110 cycles/mm) has a maximum value; and a second imaging surface; it is a specific infrared imaging plane perpendicular to the optical axis and its central field of view is The defocus modulation conversion contrast transfer rate (MTF) of a spatial frequency (110 cycles/mm) has a maximum value, wherein the optical imaging system has eight lenses having a refractive power, and at least one lens of the first lens to the eighth lens The material is plastic, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and at least one of the first lens to the eighth lens has a positive refractive power, and the first lens to the first Eight lens The focal lengths are respectively f1, f2, f3, f4, f5, f6, f7, f8, the focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging lens system is HEP, and the first lens side is to the first The imaging surface has a distance HOS on the optical axis, and the first lens object side to the eighth lens image side has a distance InTL on the optical axis, the optical imaging Half of the maximum viewing angle of the system is HAF, the distance between the first imaging surface and the second imaging surface on the optical axis is FS, and the first lens object side is at a coordinate point of 1/2 HEP height to the imaging The horizontal distance between the faces parallel to the optical axis is ETL, and the coordinate point of the height of 1/2 HEP on the side of the first lens is parallel to the optical axis between the coordinate points of the height of 1/2 HEP on the side of the eighth lens image The horizontal distance is EIN, which satisfies the following conditions: 1.0 ≦ f / HEP ≦ 10.0; 0 deg < HAF ≦ 150 deg; 0.2 ≦ EIN / ETL < 1 and | FS | ≦ 100 μm.
  11. The optical imaging system of claim 10, wherein the optical axis of the visible light on the imaging plane, 0.3 HOI, and 0.7 HOI are at a spatial frequency of 110 cycles/mm, and the modulation conversion transfer rate (MTF value) is respectively MTFQ0, MTFQ3, and MTFQ7 indicates that it satisfies the following conditions: MTFQ0 ≧ 0.2; MTFQ3 ≧ 0.01; and MTFQ7 ≧ 0.01.
  12. The optical imaging system of claim 10, wherein each of the lenses has an air gap therebetween.
  13. The optical imaging system of claim 10, wherein at least one surface of at least one of the first lens to the eighth lens has at least one inflection point.
  14. The optical imaging system of claim 10, wherein the second lens has a negative refractive power.
  15. The optical imaging system of claim 10, wherein the seventh lens image side is parallel to the optical axis between a coordinate point of a height of 1/2 HEP to a side of the eighth lens object at a height of 1/2 HEP height The horizontal distance is ED78, the seventh The distance between the lens and the eighth lens on the optical axis is IN78, which satisfies the following condition: 0 < ED67 / IN67 ≦ 50.
  16. The optical imaging system of claim 10, wherein the eighth lens has a height of 1/2 HEP and a thickness parallel to the optical axis of ETP8, and the thickness of the eighth lens on the optical axis is TP8, which satisfies the following conditions: 0<ETP8/TP8≦5.
  17. The optical imaging system of claim 10, wherein the seventh lens has a height of 1/2 HEP and a thickness parallel to the optical axis of ETP7, and the thickness of the seventh lens on the optical axis is TP7, which satisfies the following conditions: 0<ETP7/TP7≦5.
  18. The optical imaging system of claim 10, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, which satisfies the following condition: HOS/HOI ≧ 1.2.
  19. The optical imaging system of claim 10, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are at least A lens is a light filtering component having a wavelength of less than 500 nm.
  20. An optical imaging system comprising, from the object side to the image side, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; and a fourth lens having a refractive power a fifth lens having a refractive power; a sixth lens having a refractive power; a seventh lens having a refractive power; an eighth lens having a refractive power; a first average imaging surface; the visible light image plane being perpendicular to the optical axis and disposed in a central field of view of the optical imaging system, The 0.3 field of view and the 0.7 field of view are each an average position of the defocus position of each of the maximum MTF values of the field of view at a first spatial frequency (110 cycles/mm); and a second average imaging plane; The infrared light image plane of the optical axis and the central field of view of the optical imaging system, the 0.3 field of view, and the 0.7 field of view, each having a maximum MTF value of the field of view, each of the first spatial frequencies (110 cycles/mm) An average position of the optical imaging system having eight refractive powers. The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the focal lengths of the first lens to the eighth lens are respectively For f1, f2, f3, f4, f5, f6, f7, f8, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, and half of the maximum viewing angle of the optical imaging system is HAF, First lens The side to the first imaging surface has a distance HOS on the optical axis, and the first lens side to the eighth lens image side have a distance InTL on the optical axis, the first average imaging surface and the second average imaging The distance between the faces is AFS, the horizontal distance from the coordinate point of the height of 1/2 HEP on the side of the first lens to the horizontal axis of the image plane is ETL, and the height of the first lens is 1/2 HEP on the side The coordinate point to the water on the side of the eighth lens image parallel to the optical axis between the coordinate points of the height of 1/2 HEP The flat distance is EIN, which satisfies the following conditions: 1 ≦ f / HEP ≦ 10; 0 deg < HAF ≦ 150 deg; 0.2 ≦ EIN / ETL < 1 and | AFS | ≦ 100 μm.
  21. The optical imaging system of claim 20, wherein the optical axis of the visible light on the imaging plane, 0.3 HOI, and 0.7 HOI are at a spatial frequency of 55 cycles/mm, and the modulation conversion transfer rate (MTF value) is respectively MTFE0, MTFE3, and MTFE7 indicates that it satisfies the following conditions: MTFE0≧0.2; MTFE3≧0.01; and MTFE7≧0.01.
  22. The optical imaging system of claim 20, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, which satisfies the following condition: 0.5 ≦ HOS/HOI ≦ 30.
  23. The optical imaging system of claim 20, wherein the first lens has a negative refractive power.
  24. The optical imaging system of claim 20, wherein the second lens has a negative refractive power.
  25. The optical imaging system of claim 20, wherein the optical imaging system further comprises an aperture, an image sensing component, the image sensing component is disposed behind the first average imaging surface and at least 100,000 pixels are disposed, and The aperture to the first average imaging plane has a distance InS on the optical axis which satisfies the following formula: 0.2 ≦ InS/HOS ≦ 1.1.
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